#include <lib9.h>#include <draw.h>#include <memdraw.h>#include <memlayer.h>#include <cursor.h>#include "dat.h"#include "fns.h"#include "inc.h"#include "x.h" /* * Allocate a Memimage with an optional pixmap backing on the X server. */Memimage*xallocmemimage(Rectangle r, ulong chan, int pixmap){	int d, offset;	Memimage *m;	XImage *xi;	Xmem *xm; 	if(Dx(r) == 0 || Dy(r) == 0)		return nil;	if(!(m = _allocmemimage(r, chan)))		return m;	if(chan != GREY1 && chan != xconn.chan)		return m;	if(xconn.display == 0)		return m; 	/*	 * For bootstrapping, don't bother storing 1x1 images	 * on the X server.  Memimageinit needs to allocate these	 * and we memimageinit before we do the rest of the X stuff.	 * Of course, 1x1 images on the server are useless anyway.	 */	if(Dx(r)==1 && Dy(r)==1)		return m; 	xm = mallocz(sizeof(Xmem), 1);	if(xm == nil){		xfreememimage(m);		return nil;	} 	/*	 * Allocate backing store.	 */	if(chan == GREY1)		d = 1;	else		d = xconn.depth;	if(pixmap != PMundef)		xm->pixmap = pixmap;	else		xm->pixmap = XCreatePixmap(xconn.display, xconn.w, Dx(r), Dy(r), d); 	/*	 * We want to align pixels on word boundaries.	 */	if(m->depth == 24)		offset = r.min.x&3;	else		offset = r.min.x&(31/m->depth);	r.min.x -= offset;	assert(wordsperline(r, m->depth) <= m->width); 	/*	 * Wrap our data in an XImage structure.	 */	xi = XCreateImage(xconn.display, xconn.vis, d,		ZPixmap, 0, (char*)m->data->bdata, Dx(r), Dy(r),		32, m->width*sizeof(u32int));	if(xi == nil){		xfreememimage(m);		if(xm->pixmap != pixmap)			XFreePixmap(xconn.display, xm->pixmap);		return nil;	} 	xm->xi = xi;	xm->r = r; 	/*	 * Set the XImage parameters so that it looks exactly like	 * a Memimage -- we're using the same data.	 */	if(m->depth < 8 || m->depth == 24)		xi->bitmap_unit = 8;	else		xi->bitmap_unit = m->depth;	xi->byte_order = LSBFirst;	xi->bitmap_bit_order = MSBFirst;	xi->bitmap_pad = 32;	XInitImage(xi);	XFlush(xconn.display); 	m->X = xm;	return m;} voidxfreememimage(Memimage *m){	Xmem *xm; 	if(m == nil)		return; 	xm = m->X;	if(xm != nil){		if(xm->xi != nil){			xm->xi->data = nil;			XFree(xm->xi);		}		XFreePixmap(xconn.display, xm->pixmap);		free(xm);		m->X = nil;	}	_freememimage(m);}